Pollution degree 4 per IEC 60664-1 means this breaker is rated for harsh indoor environments where conductive pollution (dust, moisture, condensation) is present — typical of heavy industrial switchrooms, not clean conditioned electrical rooms. The IP40 enclosure keeps out tools and particles larger than 1 mm but does not resist water ingress; plan for location away from washdown or dripping pipes. With 4 poles (4P 4d — all poles protected) and neutral protection configurable from no protection (3D) through 0.5 x Ir (3D + N/2) to 1 x Ir (4D), this breaker fits 3-phase + N distribution where you need to select whether the neutral is protected and at what level relative to the phase pickup. The rear connection with 115 mm pitch without spreader and horizontal/vertical orientation options means busbar or cable connections are made from behind — typical for drawout or fixed-mount switchgear where front access is for controls only.
This simplifies panel layout and reduces component count, but the isolation function must be verified during commissioning per local wiring regulations.
Deployment context
This is a fixed-mount, base-plate-mounted air circuit breaker — not a DIN-rail unit. The 537 mm width, 352 mm height, and 297 mm depth define the cutout and enclosure space required. The mechanical durability of 20000 cycles with maintenance (10000 without) and electrical durability of 5000 cycles at 440 V (2500 at 690 V) align with primary distribution in industrial plants, data centers, or large commercial buildings where the breaker operates infrequently under load but must be reliable when called upon. Operating temperature range is -5 to 60 °C; storage range extends to -40 to 85 °C without the control unit or -25 to 85 °C with it. This matters for sites where the breaker may be stored in unheated warehouses before commissioning, or where the switchroom ambient can approach 60 °C under full load.